JPS61160218A - Injection molding machine - Google Patents

Injection molding machine

Info

Publication number
JPS61160218A
JPS61160218A JP152485A JP152485A JPS61160218A JP S61160218 A JPS61160218 A JP S61160218A JP 152485 A JP152485 A JP 152485A JP 152485 A JP152485 A JP 152485A JP S61160218 A JPS61160218 A JP S61160218A
Authority
JP
Japan
Prior art keywords
switching
point
injection
time
injection pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP152485A
Other languages
Japanese (ja)
Other versions
JPH0446212B2 (en
Inventor
Hiromasa Ootake
弘眞 大竹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fanuc Corp
Original Assignee
Fanuc Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fanuc Corp filed Critical Fanuc Corp
Priority to JP152485A priority Critical patent/JPS61160218A/en
Publication of JPS61160218A publication Critical patent/JPS61160218A/en
Publication of JPH0446212B2 publication Critical patent/JPH0446212B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • B29C2045/776—Measuring, controlling or regulating of velocity or pressure of moulding material determining the switchover point to the holding pressure

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To enable the change-over point of speed control to pressure control and the change-over point of injection pressure to be controlled according to the set values by compensating the lag of operation time of a servomotor. CONSTITUTION:A value P1 obtained when a processing time to changeover from injection speed control to injection pressure control is added to the lag time by an output signal, and a value P2 obtained when the processing time to changeover the injection pressure is added to the lag time of the output signal are set as parameters, which are stored in a data memory 7. Since the value of the parameter P1 means the time of the injection speed control to the changeover of a servomotor 2 due to the changeover instruction to the injection pressure control, the travelling distange of the screw is computed by the lagtime if the injection speed at the speed V is multiplied by this parameter. Therefore, if a changeover instruction is output at the point by this computed range (VXP1) before this changeover point l or at point l'', the lag is compensated and the injection speed control is changed over to the injection pressure control at the set changeover position where the lag is compensated.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は割出成形機に関し、特に射出速度制御から射出
圧制御の切換及び射出圧力の切換の制御に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an index molding machine, and more particularly to switching from injection speed control to injection pressure control and control of injection pressure switching.

従来の技術 従来の射出成形機は射出速度や射出圧力の制御を油圧を
もって行っており、この射出速度や射出圧力の切換点を
正確に制御することが難しかった。BACKGROUND OF THE INVENTION Conventional injection molding machines use hydraulic pressure to control injection speed and injection pressure, and it is difficult to accurately control the switching points of injection speed and injection pressure.

射出機構の遅れや慣性により切換点を設定しても、この
設定点どおりには切換られず、その制御がガしかった。Even if a switching point was set due to the delay or inertia of the injection mechanism, the switching would not occur according to this set point, making the control difficult.

また、射出機構をサーボモータで駆動し、上記射出速度
や射出圧力を制御する場合も同様であった。The same applies to the case where the injection mechanism is driven by a servo motor and the injection speed and injection pressure are controlled.

第３図は、サーボモータを射出機構の駆動源として使用
し、本発明の採用前の速度トルクとスクリュー位置及び
射出圧力制御時間の関係を示したもので、スクリュー位
置が１点まで速度制ａｌｌ（射出速度Ｖ）を行い、ρ点
に達した以後は経過時間がｔｌ、ｔ２．ｔ３になるまで
トルクをＴ１゜Ｔ２．Ｔ３になるよう、サーボモータを
制御して射出圧力（保圧）の制御を行うよう設定した場
合、制御系の処理時間や出力信号の遅れ時間によって、
サーボモータが切換る時点は遅れて第３図に示すように
、ｃ’　、ｔ、’　、ｔ２’　、ｔ３’点に変ってしま
い、正確な射出速度、射出圧力（保圧）の制御が行えな
いという欠点があった。Figure 3 shows the relationship between speed torque, screw position, and injection pressure control time before the adoption of the present invention when a servo motor is used as the drive source of the injection mechanism. (injection speed V), and after reaching the ρ point, the elapsed time is tl, t2. The torque is increased to T1°T2 until it reaches t3. If the servo motor is controlled to control the injection pressure (holding pressure) so that T3 is reached, depending on the processing time of the control system and the delay time of the output signal,
The point at which the servo motor switches is delayed and changes to points c', t,', t2', and t3' as shown in Figure 3, making it impossible to accurately control the injection speed and injection pressure (holding pressure). There was a drawback that there was no

発明が解決しようとする問題点 本発明は上記従来技術の問題点を解決し、サーボモータ
の動作時点の遅れを補償することによって、速度制御か
ら圧力制御（保圧制御）への切換地点及び射出圧力（保
圧）の切換点を設定値どおりに制御できるようにしたも
のである。Problems to be Solved by the Invention The present invention solves the above-mentioned problems of the prior art, and compensates for the delay in the operation point of the servo motor, thereby improving the switching point from speed control to pressure control (pressure holding control) and the injection point. This allows the pressure (holding pressure) switching point to be controlled according to the set value.

問題点を解決するための手段 第１図は、上記問題点を解決するために本発明が採用し
た手段の要部ブロック図で、本発明は、射出速度制御か
ら射出圧力制御へ切換えるスクリューの切換地点、射出
圧力の切換時間及び補正用パラメータを設定する設定手
段Ａと、該設定手段へで設定された切換地点、切換時間
及びパラメータから上記設定切換地点及び設定切換時間
に対応する切換指令地点及び切換指令時間を決定する切
換点決定手段Ｂと、該切換点決定手段で決定された切換
指令地点及び切換指令時間を記憶する記憶手段Ｃとを設
（プることによって上記問題点を解決した。Means for Solving the Problems Figure 1 is a block diagram of the main parts of the means adopted by the present invention to solve the above problems. A setting means A for setting the switching point, injection pressure switching time and correction parameters, and a switching command point and a switching command point corresponding to the setting switching point and setting switching time from the switching point, switching time and parameters set by the setting means. The above problem was solved by providing switching point determining means B for determining the switching command time and storage means C for storing the switching command point and switching command time determined by the switching point determining means.

作　　用 第２図は本発明の詳細な説明する図であるが、射出速度
（Ｖ）制御から射出圧力（Ｔ１〜Ｔ３）制御へ切換える
スクリューの切換地点ｐ及び射出圧力の切換時間ｔ、、
ｔ２．ｔ３を上記設定手段Ａから設定すると共に、射出
速度制御から射出圧力制御に切換えるときの処理時間と
出力信号の遅れ時間を加えた時間をパラメータＰ１とし
て、また射出圧力の切換時における処理時間及び出力信
号の遅れ時間を加えた時間をパラメータＰ２として上記
設定手段Ａから設定し、上記切換点決定手段Ｂは、該設
定手段Ａから設定された切換地点ｐ。Operation FIG. 2 is a diagram explaining the present invention in detail, and shows the switching point p of the screw for switching from injection speed (V) control to injection pressure (T1 to T3) control, and the switching time t of injection pressure.
t2. t3 is set from the setting means A, and the processing time and output signal delay time when switching from injection speed control to injection pressure control is set as parameter P1, and the processing time and output when switching the injection pressure are set. The time including the signal delay time is set as a parameter P2 by the setting means A, and the switching point determining means B sets the switching point p set by the setting means A.

切換時間ｔｎ（ｔｌ、ｊ２．ｊ３）とパラメータＰ１、
Ｐ２及び射出圧力制御へ切換える前の射出速度Ｖから次
の第１式、第２式で示す演算を行い、切換指令地点ｌ″
、切換指令時間（ｒｒ（ｔｌｒｒ。Switching time tn (tl, j2.j3) and parameter P1,
From P2 and the injection speed V before switching to injection pressure control, calculate the following equations 1 and 2 to determine the switching command point l''
, switching command time (rr(tlrr.

ｔ２″、［３″）を決定する。t2'', [3'') is determined.

ｆｌ　ＬＪ−ρ−ＶＸＰ１　　・・・・・・（１）ｔｎ
″＝ｔｎ　−Ｐ　２　　　　　−・−（２＞上記切換点
決定手段Ｂで決定した上記切換指令地点ｌ″、切換指令
時間ｊ　Ｊｒ　　（ｔ、　ＪＪ　、　ｔ２ｒＬ。fl LJ-ρ-VXP1 ・・・・・・(1)tn
″=tn −P 2 −·−(2>The switching command point l″ determined by the switching point determining means B, the switching command time j Jr (t, JJ, t2rL.

ｔ３″）は上記記憶手段に記憶し、射出動作を行うとき
は上記記憶手段に記憶された切換指令地点ｐ″、切換指
令時間（Ｉｔ　　（（１＃　、　ｔ　２ｒｒ。t3'') is stored in the storage means, and when performing an injection operation, the switching command point p'' and the switching command time (It ((1#, t2rr) stored in the storage means) are stored in the storage means.

１３″）によって射出機構の駆動源が制御されるから第
４図に示すように設定切換時間文及び設定切換時間ｔ１
．ｔ２．ｔ３で各々射出速度制御から射出圧制御への切
換、射出圧力の切換が行われることとなる。13'') controls the driving source of the injection mechanism, so as shown in FIG.
．． t2. At t3, the injection speed control is switched to the injection pressure control, and the injection pressure is switched.

実施例 第４図は本発明を実施する一実施例の要部ブロック図で
、１はＮＣ制御装置で、２は射出成形機のスクリューを
軸方向に駆動するサーボモータ、３は位置検出器である
。４は中央処理装置（以下ＣＰＵという）で、５は射出
成形機を制御するための制御プログラムを制御するＲＯ
Ｍ、６はデータの一時記憶等のために使用されるＲＡＭ
、７は速度制御から保圧制御への保圧切換点や保圧にお
ける射出圧力切換点等の設定値及び後述する上記設定値
から換算された上記各切換指令点のデータ等を記憶する
データメモリで不揮発性のメモリで構成されている。８
は手操作入力装置で、上記各切換点の設定データ等を入
力するものである。９は表示装置、１０は上記サーボモ
ータを制御する軸送り制御回路である。Embodiment FIG. 4 is a block diagram of essential parts of an embodiment of the present invention, in which 1 is an NC control device, 2 is a servo motor that drives the screw of an injection molding machine in the axial direction, and 3 is a position detector. be. 4 is a central processing unit (hereinafter referred to as CPU), and 5 is an RO that controls the control program for controlling the injection molding machine.
M, 6 is a RAM used for temporary storage of data, etc.
, 7 is a data memory that stores set values such as a pressure switching point from speed control to pressure holding control and an injection pressure switching point during pressure holding, and data of each switching command point converted from the above set values, which will be described later. It consists of non-volatile memory. 8
is a manual input device for inputting setting data, etc. of each of the above-mentioned switching points. 9 is a display device, and 10 is an axis feed control circuit that controls the servo motor.

次に、本実施例の動作を第５図の動作フローと共に説明
する。Next, the operation of this embodiment will be explained with reference to the operation flow shown in FIG.

まず、上記手操作入力装置８から射出速度制御から射出
圧制御へ切換るスクリューの切換地点ｐ（第２図参照）
及び射出圧の切換時間ｔｎ（ｔｌ。First, the screw switching point p (see Fig. 2) is used to switch from injection speed control to injection pressure control using the manual input device 8.
and injection pressure switching time tn(tl.

ｔ２．ｔ３・・・）を設定し、さらに射出速度制御から
射出圧制御へ切換ねるときの処理時間と出力信号の遅れ
時間とを加えた値Ｐ１及び射出圧切換時の処理時間と出
力信号の遅れ時間とを加えた値Ｐ２をパラメータとして
設定し、データメモリ７へ記憶させる。そして、設定入
力指令を入力するとＣＰＵ４は、データメモリ７から切
換地点文とパラメータＰ１を読出すと共にすでに設定さ
れてい−〇− る射出圧制御へ切換る前の射出速度Ｖを読出しくステッ
プＳ１）、、第１式で示した演算（ｆｔ″−，１−ＶＸ
Ｐｌ）を行う（ステップＳ２）。t2. t3...), and the sum of the processing time and output signal delay time when switching from injection speed control to injection pressure control, P1, and the processing time and output signal delay time when switching injection pressure. The value P2 obtained by adding the above is set as a parameter and stored in the data memory 7. Then, when the setting input command is input, the CPU 4 reads out the switching point statement and parameter P1 from the data memory 7, and reads out the injection speed V before switching to the injection pressure control that has already been set (step S1). ,, the operation shown in the first equation (ft''-, 1-VX
Pl) (step S2).

即ち、パラメータＰ１の値は射出速度制御から射出圧ツ
ノ制御への切換指令によりザーボモータ２が切換わるま
での遅れ時間を意味するから、このパラメータＰ１にそ
の時の射出速度Ｖを乗算すれば遅れ時間によりスクリュ
ーが移動する距離が算出される。その結果、切換地点で
よりもこの算出された距離（ＶＸＰｌ）だけ前の位置、
即ちＩ　ＩＩで切換指令を出せば、上記遅れが補償され
設定切換位置で射出速度制御から射出圧力制御へと切換
えられることを意味する。そこで、この値ρ″で切換指
令位置としてデータメモリ７へ記憶させる（ステップＳ
３）。次に、指標１１を「１」にセットしくステップＳ
４）、データメモリ７からパラメータＰ２を読出しくス
テップＳ５）、指標ｎの値に対応する切換時間ｔｎを読
出しくステップ８６）、第２式の演算（ｔｎ″＝　ｔｎ
−Ｐ　２　）を行う。即ち、切換指令から実際に射出圧
力が切換るまでの遅れ時間Ｐ２を補償し、切換時間ｔｎ
よりも遅れ時間Ｐ２だけ早い時間ｔｎ″で切換指令を出
せば、結果的に設定切換時間ｔｎで実際に射出圧が切換
ねることとなる。そこでこの値ｔｎ　ｒＬを切換指令時
間としてデータメモリ７に記憶させ（ステップＳ８）、
指標ｎに１１」加え（ステップＳ９）、指標ｎの値が射
出圧力切換の数Ｍ（第２図においてはＭ−３）に達した
か否か判断しくステップ５１０）、達していなければ再
びステップ８６以下の処理を繰り返してすべての射出圧
力の設定切換点ｔｎに対応する射出指令時間ｔｎ″をデ
ータメモリ７に記憶させ、指標ｎが射出圧力切換の数Ｍ
に達すると、切換地点、切換時間の設定入力処理は終了
する。That is, since the value of parameter P1 means the delay time until the servo motor 2 is switched by the switching command from injection speed control to injection pressure horn control, if this parameter P1 is multiplied by the injection speed V at that time, the delay time will be The distance traveled by the screw is calculated. As a result, a position that is this calculated distance (VXPl) earlier than the switching point,
That is, if a switching command is issued at I II, the above delay is compensated for and the injection speed control is switched to the injection pressure control at the set switching position. Therefore, this value ρ'' is stored in the data memory 7 as the switching command position (step S
3). Next, step S sets the index 11 to "1".
4), read the parameter P2 from the data memory 7 (step S5), read the switching time tn corresponding to the value of the index n (step 86), calculate the second equation (tn″=tn
- P 2 ). That is, the delay time P2 from the switching command to the actual switching of the injection pressure is compensated for, and the switching time tn
If the switching command is issued at time tn'', which is earlier by delay time P2, the injection pressure will actually be switched at the set switching time tn.Therefore, this value tnrL is stored in the data memory 7 as the switching command time. memorize (step S8),
11'' is added to the index n (step S9), and it is determined whether the value of the index n has reached the number M (M-3 in FIG. 2) of injection pressure switching (step 510), and if it has not reached the number, the step is repeated again. 86 and subsequent steps are repeated to store the injection command time tn'' corresponding to all the injection pressure setting switching points tn in the data memory 7, and the index n is the number M of injection pressure switching.
When the switching point and switching time are reached, the setting input process for the switching point and switching time ends.

そして、射出成形機が射出動作を行うときは、このデー
タメモリ７に記憶された切換指令地点ｌ″、切換指令時
間ｔｎ″に従って射出速度制御から射出圧制御への切換
及び射出圧の切換指令が出されるから、第２図に示すよ
うに切換設定値に合致した地点及び時間に射出速度制御
から射出圧制御への切換、射出圧の切換が行われること
となる。When the injection molding machine performs an injection operation, the switching command from injection speed control to injection pressure control and the switching command for injection pressure are issued according to the switching command point l'' and switching command time tn'' stored in the data memory 7. As shown in FIG. 2, the injection speed control is switched to the injection pressure control and the injection pressure is switched at a point and time that match the switching set value.

発明の効果 本発明は切換のための処理時間と出力信号の遅れ時間を
補償して射出速度制御から射出圧制御への切換及び射出
圧の切換の指令を出せるようにしたから遅れがなく設定
値どおり正確に切換るから品質のよい成形品を製造する
ことができる。Effects of the Invention The present invention compensates for the processing time for switching and the delay time of the output signal so that commands for switching from injection speed control to injection pressure control and injection pressure switching can be issued, so there is no delay and the set value can be changed. Since the switching is performed accurately, high-quality molded products can be manufactured.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明による従来技術の問題点を解決するため
の手段の要部ブロック図、第２図は本発明による削出成
形機の動作を説明する図、第３図は従来の射出成形機の
動作を説明する図、第４図は本発明の一実施例の要部ブ
ロック図、第５図は同実施例の動作フローである。 １・・・ＮＧ制御装置。Figure 1 is a block diagram of the main parts of a means for solving the problems of the prior art according to the present invention, Figure 2 is a diagram explaining the operation of the cutting molding machine according to the present invention, and Figure 3 is a diagram of the conventional injection molding machine. FIG. 4 is a block diagram of a main part of an embodiment of the present invention, and FIG. 5 is a flowchart of the operation of the embodiment. 1...NG control device.

Claims (1)

【特許請求の範囲】[Claims] 射出成形機において、射出速度制御から射出圧力制御へ
切換えるスクリューの切換地点、射出圧力の切換時間及
び補正用パラメータを設定する設定手段と、該設定手段
で設定された切換地点、切換時間及びパラメータから上
記設定切換地点及び設定切換時間に対応する切換指令地
点及び切換指令時間を決定する切換点決定手段と、該切
換点決定手段で決定された切換指令地点及び切換指令時
間を記憶する記憶手段とを有し、該記憶手段に記憶され
た切換指令地点及び切換指令時間に基づいて射出機構の
駆動源を切換え制御することを特徴とする射出成形機。In an injection molding machine, a setting means for setting a screw switching point for switching from injection speed control to injection pressure control, an injection pressure switching time, and correction parameters, and a switching point, switching time, and parameters set by the setting means. A switching point determining means for determining a switching command point and a switching command time corresponding to the setting switching point and setting switching time, and a storage means for storing the switching command point and switching command time determined by the switching point determining means. An injection molding machine characterized in that the drive source of the injection mechanism is switched and controlled based on the switching command point and switching command time stored in the storage means.
JP152485A 1985-01-10 1985-01-10 Injection molding machine Granted JPS61160218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP152485A JPS61160218A (en) 1985-01-10 1985-01-10 Injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP152485A JPS61160218A (en) 1985-01-10 1985-01-10 Injection molding machine

Publications (2)

Publication Number Publication Date
JPS61160218A true JPS61160218A (en) 1986-07-19
JPH0446212B2 JPH0446212B2 (en) 1992-07-29

Family

ID=11503895

Family Applications (1)

Application Number Title Priority Date Filing Date
JP152485A Granted JPS61160218A (en) 1985-01-10 1985-01-10 Injection molding machine

Country Status (1)

Country Link
JP (1) JPS61160218A (en)

Also Published As

Publication number Publication date
JPH0446212B2 (en) 1992-07-29

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